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(No Model.) 2 Sheets-Sheet 1. T. UROUHART. DEVICE FOR TURNING (FRANK PINS.

I:Eafezndned Aug. 28, 1888.

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(No Model.) 2 Sheets-Sheet 2. T. URQUHART.

DEVICE POR TURNING CRANE PINS. No. 388,745. Patented'Aug. 28, 1888.

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PATENT THOMAS URQUHART, OF BORISSOGLEBSK, TAMBOF, RUSSIA.

DEVICE FOR TURNING CRANKfPINS.

SPECIFICATION forming part of Letters Patent No. 388,745, dated August 28, 1888.

Application filed May S29, 1888. Serial No. 275,466. (No model.)

on the said axles coupled by means of connecting or coupling rods iit-ting upon crank-pins inserted in the hubs or arms of the said wheelsit is desirable that the said wheels should be coupled or connected together by inelastic connecting or coupling rods in such a manner that the said wheels may revolve simultaneously without resistance other than that due to friction. In order to attain this result, all the cranks of cach side of a locomotive must have the same radius, and the angles formed between the lines of radius of the cranks on one side ofthe locomotive and the lines of radius of the cranks on the opposite side of the locomotive must be equal in all the wheels. This angle is usually one of ninety degrees, or a quarter of the circle.

In the continuous working of locomotives with four, six, eight, ten, or more coupled wheels, the crank-pins, by running mostly in one direction-that is, forward-are Worn almost altogether on one side. Moreover, the wear is not equal in all the pins, the main or center' pins being subject to considerably greater wear than the end ones, thus destroying the equality ot' the angles between the cranks on. one side of the locomotive and those on the other side, and also affecting the radius. Moreover, the crank pins are worn oval. These defects cause greater resistance in the working parte of the locomotive, heating of the coupling-rod brasses,and consequently frequent breakages of the coupling-rods and of the crank pins, and also very disagreeable thumping or knocking in the working parts, as the said parts, owing to the abovementioned defects, have to be fitted very loosely upon the crank-pins.

The main object of this invention is to provide improved means whereby' the crank-pins in the wheels of locomotives can be turned up or trued up in their places and the above defects thus obviated or greatly diminished.

In turning or truing up locomotive crankpins according to my said invention the locomotive-wheels are either left in position under the locomotive or the axles with the two Wheels xed upon them are removed to some convenient position where power for driving the machine-tool can be obtained. A separate motor is sometimes employed, which is connected directly to the said machinetool7 or power is transmitted to the s aid machinetool by belt-gearing or rope-gearing.

In the accompanying drawings [haveshown how my said invention can be conveniently and advantageously carried into practice.

Figure l is a front elevation, partly in vertical section, of my improved machine-tool or apparatus, part of the worm-wheel, hereinafter described, being removed. Fig. 2 is a plan of the said machine tool or apparatus partly in vertical section. Fig. 3 is a section upon the line m zu, Fig. 1. Fig. 4 is a front elevation of the ratchet and handle, hereinafter described.

Like letters indicate corresponding parts throughout the drawings.

A is a bracket provided with two surfaces, a a', planed truly at an angle of ninety degrecs to each other. The surface a is to be secured to the hub or face of the locomotive or other wheel (which forms a convenient base for supporting it) by means of bolts a2, which pass through slots a3, provided for that purpose in the bracket A. On the other planed surface,a, is :tltted the head-stock B,provided with V-shapcd parts b, and having a sliding movement longitudinally in the correspondingly-shaped portions b b2 of the said bracket A. The partor portion b2 is fixed to the bracket A by means of bolts Zfpassing through slotted holes in the said part bl. Setting-up screws b* are, moreover, provided for adjusting the part b2 to compensate for any wear that may take place. The reciprocating movement ol' the head-stock Bis obtained by a screw, c, working in a nut, c', tted to the under side of the said headstock B, a suitable recess, d, being provided in the bracket A. for the said screw. The head-stock Bis thus brought com- IOO pletely under control. In the said head-stock B is fitted a revolving hollow spindle or sleeve, e, of sufficient internal diameter to admit the largest crank-pin in use on locomotives or that it may be desired to turn or true up. On one end of this hollow spindle or sleeve c is fixed a worm wheel, f, engaging with a worm, g, fixed or formed on the spindle 71., which is supported in bearings i z" in the head-stock B. The said spindle h has, moreover, on its Outer extremity the fast pulley j and the loose pulley j for driving the machine by power, and is also provided with a square end, k, to receive the crank-handle l, for turning the machine by hand, if desired.

On the opposite end of the hollow spindle or sleeve e-that is, on the end next to the locomotive-wheel-'and firmly attached to or cast in one piece with the said hollow spindle or sleeve e are one or more tool holders or pockets, m, in one Of which a steel cutting-tooL/n, is inserted for turning up or truing up the crank-pin upon which it is desired to operate. The object Of providing more than one pocket or tool-holder is to have a spare one in case Of accident. The said tool holders or pockets m are provided, moreover, each with two adj ust! ingscrews, m', for holding the tool n in position; also with a screw, m2, under control of the operator, for regulating .the depth of the cut.

In order to render the above-described machine tool or apparatus equally applicable for locomotives having various radii of cranks, a suitable center, o, is fixed by means of the nut ofin a movable plate, p, inserted in a corresponding aperture provided in the surface a of the bracket A and adapted to slide in or out upon the line of radius in the slot g. This center o can be placed in position before securing the main bracket A to the wheel, the radius of the crank having first to be ascertained.

'Io adjust the machine tool or apparatus in position and to find the original center of the crank-pin, the head or collar of the crank-pin, which is not usuallyworn, is taken as a basis, and the bracket A is moved in any direction until a position corresponding to the center of the unworn collar or head of the crank-pin is found. The main bracket A is then fastened firmly by the bolts a2, passing between the arms of the locomotive-wheel and through the slots a in the part a of the bracket A.

The above-described machine tool or apparatus can be made self-acting as follows-that is to say: A suitable pin, r, is fixed in the worm wheel fand provided with a hook, s, to which is attached a chain or cord, t, passing over a sheave or pulley, u, fixed in any convenient manner above the said hook s. The other extremity of this chain or cord tis attached to another hook, o, or is connected in any other convenient manner to the handle w of the ratchet m, fitted at the extremity of the feed-y ing-screw c, provided in the main bracket A, and taking the place of the crank-handle for actuating the said head-stock B by hand, as

hereinbeforc described. The handle w of the ratchet x is, moreover, provided with a counterbalance-weight, y, which causes the said handle w to fall when the chain or cord t is slackened during one-half Of each revolution of the worm-wheelf.

The Operation of the apparatus is as followsthat is to say: First, one or more cuts are taken off the crank-pin which it is desired to turn up or true up by means of a roughing-tool inserted in one of the said tool holders or pockets m in the hollow spindle or sleeve e. The

crank-pin is then nished off with a spring-v tool, and no further filing or polishing is required.

Although I have hereinbefore described my said invention more particularly for turning up or truing up locomotive crank-pins, it is obvious that it can also be adapted for turning up or truing up crank-pins or the like upon any other engines or machines in their places.

It is, moreover, evident that I can modify the construction of my said apparatus without in any way departing from the nature of my said invention.

l. In a machine-tool for the purposes above specified, a hollow spindle or sleeve provided with a tool holder or pocket and means for rotating the said spindle or sleeve upon or about its axis and feeding or moving it longitudinally, substantially as set forth.

2. The combination of a bracket, A, a headstock, B, a hollow spindle or sleeve, e, having a tool holder or pocket, m, means for rotating said spindle or sleeve, and means for feeding or moving the same longitudinally, substantially as and for the purpose set forth.

3. The combination of the bracket A, having planed surfaces a a and slots a3, the headstock B, the screw c and means for intermittently rotating the same, and the movable or adjustable center o, substantially as and for the purpose described.

4. The combination, with the bracket A, head-stock B, hollow spindle or sleeve e, and worm-wheel f, of the screw c and the ratchet x, provided with a counter-weight and connected with the said worm-wheel by a cord or chain, t, substantially as and for the purposes set forth.

5. The combination, with the head-stock B and hollow spindle Or sleeve e, of the wormwheelf, the worm g, the spindle h, and means for rotating the same, substantiall y as and for the purpose specified.

6. The hollow spindle e, provided with a tool holder or pocket, m, and screws m' mi, substantially as described.

In testimony whereof I have hereunto signed my name in the presence of two subscribing witnesses.

THOMAS URQUHART.

Witnesses:

J osErH WASHINGTON COOPER, RICHARD COOPER,

Both of 13 Hospital Street, Borz'ssoglebsk.

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